I worked briefly on San Clemente Island off the California coast. They have an endangered bird, the loggerhead shrike, that a team of biologists was coaxing back to viability. This apparently involved waking up really early to prep the "pinkies." This involved taking tiny, nearly hairless mice, bashing their heads into the curb to stun them, and offering their bloody little maimed bodies to the birds held in captivity at the bio station.

The thing that boggled my mind was that the people who did this were the same ones who screamed and threw a fit if you used butter in their "vegan" pans.